BIOTIC Species Information for Caecum armoricum
Researched byNicola White Data supplied byMarLIN
Refereed byDennis R. Seaward
Distribution and Habitat
Distribution in Britain & IrelandOnly recorded living from The Fleet, Dorset. One shell record from Connemara, W. Ireland (J.E. Phorson, per. comm..)
Global distributionShell records from the Black Sea, Mediterranean, Azores, Canary Isles and the Atlantic coast from Gibraltar to the Channel. The only other known live colony is from a site in the south Gibraltar Strait, N. Africa.
Biogeographic rangeNot researched Depth rangeSee additional information
MigratoryNon-migratory / Resident   
Distribution Additional InformationFound in the mid to lower eulittoral within marine percolation. The fleet population occurs at depth within loose shingle of about 2 cm size, where sea water percolates and where soft flocculent silty material is present but leaving plenty space subject to gently flowing water. Molluscan associates are another small prosobranch Onoba aculeus and the bivalve Lasaea adansoni; in the pale variety pallida.

Substratum preferencesGravel / shingle
Physiographic preferencesIsolated saline water (Lagoon)
Biological zoneMid Eulittoral
Lower Eulittoral
Wave exposureVery Sheltered
Tidal stream strength/Water flowVery Weak (negligible)
SalinityVariable (18-40 psu)
Habitat Preferences Additional Information
Distribution References Barnes, 1994, Seaward, 1987, Seaward, 1989, Hoeksema & Segers, 1993,
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